<!DOCTYPE html>
<!-- Generated by pkgdown: do not edit by hand --><html lang="en"><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8"><meta charset="utf-8"><meta http-equiv="X-UA-Compatible" content="IE=edge"><meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no"><title>Utility to load a couple of datasets using data immediately instead of relying on lazy loading — dataload_from_package • EJAM</title><!-- favicons --><link rel="icon" type="image/png" sizes="16x16" href="../favicon-16x16.png"><link rel="icon" type="image/png" sizes="32x32" href="../favicon-32x32.png"><link rel="apple-touch-icon" type="image/png" sizes="180x180" href="../apple-touch-icon.png"><link rel="apple-touch-icon" type="image/png" sizes="120x120" href="../apple-touch-icon-120x120.png"><link rel="apple-touch-icon" type="image/png" sizes="76x76" href="../apple-touch-icon-76x76.png"><link rel="apple-touch-icon" type="image/png" sizes="60x60" href="../apple-touch-icon-60x60.png"><script src="../deps/jquery-3.6.0/jquery-3.6.0.min.js"></script><meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no"><link href="../deps/bootstrap-5.3.1/bootstrap.min.css" rel="stylesheet"><script src="../deps/bootstrap-5.3.1/bootstrap.bundle.min.js"></script><link href="../deps/font-awesome-6.4.2/css/all.min.css" rel="stylesheet"><link href="../deps/font-awesome-6.4.2/css/v4-shims.min.css" rel="stylesheet"><script src="../deps/headroom-0.11.0/headroom.min.js"></script><script src="../deps/headroom-0.11.0/jQuery.headroom.min.js"></script><script src="../deps/bootstrap-toc-1.0.1/bootstrap-toc.min.js"></script><script src="../deps/clipboard.js-2.0.11/clipboard.min.js"></script><script src="../deps/search-1.0.0/autocomplete.jquery.min.js"></script><script src="../deps/search-1.0.0/fuse.min.js"></script><script src="../deps/search-1.0.0/mark.min.js"></script><!-- pkgdown --><script src="../pkgdown.js"></script><meta property="og:title" content="Utility to load a couple of datasets using data immediately instead of relying on lazy loading — dataload_from_package"><meta name="description" content="Utility to load a couple of datasets using data immediately instead of relying on lazy loading"><meta property="og:description" content="Utility to load a couple of datasets using data immediately instead of relying on lazy loading"><meta property="og:image" content="https://usepa.github.io/EJAM/logo.svg"></head><body>
    <a href="#main" class="visually-hidden-focusable">Skip to contents</a>


    <nav class="navbar navbar-expand-lg fixed-top bg-light" data-bs-theme="light" aria-label="Site navigation"><div class="container">

    <a class="navbar-brand me-2" href="../index.html">EJAM</a>

    <small class="nav-text text-warning me-auto" data-bs-toggle="tooltip" data-bs-placement="bottom" title="Released version">2.32.0</small>


    <button class="navbar-toggler" type="button" data-bs-toggle="collapse" data-bs-target="#navbar" aria-controls="navbar" aria-expanded="false" aria-label="Toggle navigation">
      <span class="navbar-toggler-icon"></span>
    </button>

    <div id="navbar" class="collapse navbar-collapse ms-3">
      <ul class="navbar-nav me-auto"><li class="active nav-item"><a class="nav-link" href="../reference/index.html">Reference</a></li>
<li class="nav-item dropdown">
  <button class="nav-link dropdown-toggle" type="button" id="dropdown-articles" data-bs-toggle="dropdown" aria-expanded="false" aria-haspopup="true">Articles</button>
  <ul class="dropdown-menu" aria-labelledby="dropdown-articles"><li><hr class="dropdown-divider"></li>
    <li><h6 class="dropdown-header" data-toc-skip>Overview for EJAM Users</h6></li>
    <li><a class="dropdown-item" href="../articles/0_whatis.html">What is EJAM</a></li>
    <li><a class="dropdown-item" href="../articles/0_webapp.html">Using EJAM</a></li>
    <li><hr class="dropdown-divider"></li>
    <li><h6 class="dropdown-header" data-toc-skip>For analysts using R</h6></li>
    <li><a class="dropdown-item" href="../articles/1_installing.html">Installing the EJAM R package</a></li>
    <li><a class="dropdown-item" href="../articles/2_quickstart.html">Quick Start Guide</a></li>
    <li><a class="dropdown-item" href="../articles/3_analyzing.html">Basics of Using EJAM for Analysis in RStudio</a></li>
    <li><a class="dropdown-item" href="../articles/4_advanced.html">Advanced Features</a></li>
  </ul></li>
<li class="nav-item"><a class="nav-link" href="../news/index.html">Changelog</a></li>
      </ul><ul class="navbar-nav"><li class="nav-item"><form class="form-inline" role="search">
 <input class="form-control" type="search" name="search-input" id="search-input" autocomplete="off" aria-label="Search site" placeholder="Search for" data-search-index="../search.json"></form></li>
<li class="nav-item"><a class="external-link nav-link" href="https://github.com/USEPA/EJAM/" aria-label="GitHub"><span class="fa fab fa-github fa-lg"></span></a></li>
      </ul></div>


  </div>
</nav><div class="container template-reference-topic">
<div class="row">
  <main id="main" class="col-md-9"><div class="page-header">
      <img src="../logo.svg" class="logo" alt=""><h1>Utility to load a couple of datasets using data immediately instead of relying on lazy loading</h1>
      <small class="dont-index">Source: <a href="https://github.com/USEPA/EJAM/blob/HEAD/R/dataload_from_package.R" class="external-link"><code>R/dataload_from_package.R</code></a></small>
      <div class="d-none name"><code>dataload_from_package.Rd</code></div>
    </div>

    <div class="ref-description section level2">
    <p>Utility to load a couple of datasets using data immediately instead of relying on lazy loading</p>
    </div>

    <div class="section level2">
    <h2 id="ref-usage">Usage<a class="anchor" aria-label="anchor" href="#ref-usage"></a></h2>
    <div class="sourceCode"><pre class="sourceCode r"><code><span><span class="fu">dataload_from_package</span><span class="op">(</span></span>
<span>  olist <span class="op">=</span> <span class="fu"><a href="https://rdrr.io/r/base/c.html" class="external-link">c</a></span><span class="op">(</span><span class="st">"blockgroupstats"</span>, <span class="st">"usastats"</span>, <span class="st">"statestats"</span><span class="op">)</span>,</span>
<span>  envir <span class="op">=</span> <span class="fu"><a href="https://rdrr.io/r/base/environment.html" class="external-link">globalenv</a></span><span class="op">(</span><span class="op">)</span></span>
<span><span class="op">)</span></span></code></pre></div>
    </div>

    <div class="section level2">
    <h2 id="arguments">Arguments<a class="anchor" aria-label="anchor" href="#arguments"></a></h2>


<dl><dt id="arg-olist">olist<a class="anchor" aria-label="anchor" href="#arg-olist"></a></dt>
<dd><p>vector of strings giving names of objects to load using data().
This could also include other large datasets that are slow to lazyload but not always needed:
"frs", "frs_by_programid ", "frs_by_naics", etc.</p></dd>


<dt id="arg-envir">envir<a class="anchor" aria-label="anchor" href="#arg-envir"></a></dt>
<dd><p>the environment into which they should be loaded</p></dd>

</dl></div>
    <div class="section level2">
    <h2 id="value">Value<a class="anchor" aria-label="anchor" href="#value"></a></h2>
    <p>Nothing</p>
    </div>
    <div class="section level2">
    <h2 id="details">Details<a class="anchor" aria-label="anchor" href="#details"></a></h2>
    <p>See also read_builtin() function from the readr package!</p>
<p>Default is to load some but not all the datasets into memory immediately.
<a href="blockgroupstats.html">blockgroupstats</a>, <a href="usastats.html">usastats</a>, <a href="statestats.html">statestats</a>, and some others are always essential to EJAM, but
<a href="frs.html">frs</a> and <a href="frs_by_programid.html">frs_by_programid</a> are huge datasets (and <a href="frs_by_sic.html">frs_by_sic</a> and <a href="frs_by_naics.html">frs_by_naics</a>)
and not always used - only to find regulated facilities by ID, etc.
The frs-related datasets here can be roughly 1.5 GB in RAM, perhaps.</p>
    </div>
    <div class="section level2">
    <h2 id="see-also">See also<a class="anchor" aria-label="anchor" href="#see-also"></a></h2>
    <div class="dont-index"><p><code><a href="datapack.html">datapack()</a></code> <code><a href="dataload_from_aws.html">dataload_from_aws()</a></code> <code><a href="dataload_from_pins.html">dataload_from_pins()</a></code> <code><a href="dataload_from_local.html">dataload_from_local()</a></code> <code><a href="indexblocks.html">indexblocks()</a></code> <code><a href="https://rdrr.io/r/base/ns-hooks.html" class="external-link">.onAttach()</a></code></p></div>
    </div>

    <div class="section level2">
    <h2 id="ref-examples">Examples<a class="anchor" aria-label="anchor" href="#ref-examples"></a></h2>
    <div class="sourceCode"><pre class="sourceCode r"><code><span>  <span class="va">x</span> <span class="op">&lt;-</span> <span class="fu"><a href="datapack.html">datapack</a></span><span class="op">(</span><span class="st">"EJAM"</span><span class="op">)</span></span>
<span>  <span class="fu"><a href="https://rdrr.io/r/base/subset.html" class="external-link">subset</a></span><span class="op">(</span><span class="va">x</span>, <span class="va">x</span><span class="op">$</span><span class="va">size</span> <span class="op">&gt;=</span> <span class="fl">0.1</span><span class="op">)</span> <span class="co"># at least 100 KB</span></span>
<span>  <span class="fu"><a href="https://rdrr.io/r/base/grep.html" class="external-link">grep</a></span><span class="op">(</span><span class="st">"names_"</span>, <span class="va">x</span><span class="op">$</span><span class="va">Item</span>, value <span class="op">=</span> <span class="cn">T</span>, ignore.case <span class="op">=</span> <span class="cn">T</span>, invert <span class="op">=</span> <span class="cn">T</span><span class="op">)</span> <span class="co"># most were like names_d, etc.</span></span>
<span>  <span class="fu"><a href="https://rdrr.io/r/base/ls.html" class="external-link">ls</a></span><span class="op">(</span><span class="op">)</span></span>
<span>  <span class="fu"><a href="https://rdrr.io/r/utils/data.html" class="external-link">data</a></span><span class="op">(</span><span class="st">"avg.in.us"</span>, package<span class="op">=</span><span class="st">"EJAM"</span><span class="op">)</span> <span class="co"># lazy load an object into memory and make it visible to user</span></span>
<span>  <span class="fu"><a href="https://rdrr.io/r/base/ls.html" class="external-link">ls</a></span><span class="op">(</span><span class="op">)</span></span>
<span>  <span class="fu"><a href="https://rdrr.io/r/base/rm.html" class="external-link">rm</a></span><span class="op">(</span><span class="va">avg.in.us</span>, <span class="va">x</span><span class="op">)</span></span>
<span>  </span></code></pre></div>
    </div>
  </main><aside class="col-md-3"><nav id="toc" aria-label="Table of contents"><h2>On this page</h2>
    </nav></aside></div>


    <footer><div class="pkgdown-footer-left">
  <p>US EPA 2024</p>
</div>

<div class="pkgdown-footer-right">
  <p>EJAM Version 2.32.0</p>
</div>

    </footer></div>





  </body></html>

